Fluid-operated percussive-tool.



' 'L. o. BAYLES. FLUID OPERATBD PERCUSSIVE TOOL.

APPLICATION FILED JUNE 9, 19144 eatema Feb. 2, i915.

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LEE/'IS C. 'BAYLE OF EASTN, 'PENNSYLVANIA, ASSIGNOR T0 EVNGIERSOLL-BAND CQTWPNY, 0F JERSEY CITY, NAVI' JERSEY, A CORFHATION OF NEW JERSEY.

FLUD-OERATED PERCUSSEV TOOL.

Specification of Letters Patent.

Application filed .Tune 9, 1914. Sez/a1 No. Sf.

ie it known that Lziifis C. Harms, a eitivzen ol' the United l'tates, residingat 'Has ton, in the county of iorthainpton anti State et ieniisyivania, have inrenteda certainv new anni iiseiini improvement in Fluid-0poraieil Pere: wire Tools, ot which the iiol lowing isf a specification.

rhis im'ention relates to i'inid operated permissive tools, and more. miftxoiiiarly to tools of the type wherein. the admission oi' .finiti is controlled primariiy by the morei v piston and valve in different positions.

n the drawings is shown a too/i i'iaring z ojiiiniier l comp.. sing' a smaller rearward hero` and a larger orwarii bore 3. Sliding" in the cylinder is piston i haring a .head 5 sliding' in the fornarfi bore and a siianl; (i sliding in the rearward here, t. 1ere being; a 12e between the hind 5 and shank (i. v The iiiisi'on has, therefore, two sma'lier pressure .sinrliwes for driving; it forward and aiarger surface for drivin@ it rearwarti.

i enti .of bore hy a. passage i.. ioni the passafi'e f5 a passage .fl extends irons the bore 2 fore Q near wa 'o en@ opening into the its 'io l. `1 ai'. such a. point tiat at the enti oi the rear ward. stroke o tie gaston, finiti pressure is admitted to there: end of bore 3, t n.. e hei l n ing' thas an .interi ittent pressure on the rear or the heafi Jong the olt here, Qfis ire ehest- O. .Tinto the side of this chestli'l near its rear enoi a front end supply port lil opens. From the side of the vaii'e chest l?) a iiltle forward et' the port il a passage .ie/ads to the extreme front enti. oit' the eyiineier. Forward of this an exhaust poi-t 13 leads to atmosphere, whiie stili .while the Al'ront enel of here ther forward is the opening of an exhaust passage M- irhieh la :if from the side of the bore 3 at such a point that it will be nneor ered hy the re: r liaoe it piston head 5 soon after passage i) is Closed. h r the shank 3 of the piston. ralxihng in the valve #liest .is a' Valve which has a slianlf: and two hea. these being; so arraiigi-d that in the rearward position of Ythe ire passage will he oonnected with exhaust port '13, While in the forward position of the valre, passage 'E will he connected with front end supply port ll while exhaust passage l-,lxviii he connect-eci. with pori 1.53. To supply pressure to more the valve a' ijiassage 16 leails to the forward'end of the valve chest from the rear end ol here 5%, while a passage l? ieads from bore 2 to the rear end oiI the ltaire chest from a point farther forward Vhan port ll, the passage 17 aiso serving to supply iui-d dining part of the stroke to the passage l2 when the valve is in its forward position. From the rear end of the faire chest, a leak port 18 leads to atmosphere. 'io aid the niorenient 'otl the valve an anxiliarv exhaust port if) is provided. in the side of)v bore 3. this port being so placed as to lie unfoverod bj; the piston heaffl near the enel its stroke in either direction.

in operation, snpposi g., th the positions shown in afhnitted 'to the r haust through passage l2 'trinit uncovers passage i-l rents, @scape of iiniifi. ii reaehes the iorwarii enel of rear face of the pison head auxiliary ehanst" 'port esi i. l'aid in the back enti oi the here 3 inthe forward end of the valve chest 10. At the saine time the rear face of the shank 6 will uncover passage 17 allowing fluid under .pressure to enter the rear end of the valve chest 10 and throv\7 the valve 15 forvvard.l This will allow iiuid to pass to the forward end of the bore 3 through the passage l2, While at the same time passage 11i will be connected with port 13. IThis position of the 10 parts is shown in Fig. l. The piston will therefore move rearwardly the admission of iiuid to the front end of looi'e 3 continuing until the rear end of the shank 6 cuts off port 11. When the piston nears the rear end of 15 its stroke pressure Will again he admitted to the back end of bore 3 and hence the for- Ward end of the valve chest 10, while the fluid in the rear end of lthe valve chest Will be exhausted through passage 12-and port 19 and also through leak port 18, the valve moving rearwardly and the above cycle of oper tions being repeated.

Although the tool as here shown has intermittent pressure in the rear end of bore 3,

this might loe eliminated and the valve 15- only control the admission and exhaust to the front end ofV bore 3, and it is to be understood, that While the present showing and description discloses only one specified modification of this inventiomotlier forms and modifications are included in the spirit and scope of the invention as expressed in /the claims.

What l claim is l. fina iiuid operated percussive tool, a cylinder of two diameters, a piston therein having a head and a shank, means for exerting a constant pressure on the end of said shank, a passage leading `to the other end 40 of the cylinder, a supply port opening from said constant pressure portion of the cylinder, an exhaust port, a valve adapted in one position to connect said supply port and said passage and in the other osition to connect said exhaust port and said passage,

an operatin surface on said valve, and a passage lea ing from a point' in said constant pressure cylinder portion inward of said supply Jort to convey fluid to said operating sur ace, said second passage also serving to supply fluid to said first passage.

Q. In a fluid operated percussive tool, a cylinder of two diameters, a piston therein having a head and a shank, means for exerting,r a constant pressure onthe end of said shank, a passage .leading to the other end yofthe cylinder, a supply port opening from said constant pressure portion of the cylinder, an 4exhaust port, a valve adapted inI 60. one positionto connect said supply port and said passare and'in the other position to connect sai exhaust port and said passage, an operating surface on said valve, and a paage leading from a point in said constant pressure cylinder portion inward of said supply port to convey fluid to said operating surface.

'3. In a iiuid operated percussive tool, a cylinder of two diameters, a piston therein having' tivo small surfaces for driving it in one direction and a surface for driving it in the 'other' direction, means for exerting a `constant pressure on one of said smaller surfaces, a passage leading from they constant pressure portion of the cylinder for conveying pressure to' exert an intermittent pressure on said' larger surface, a passage controlled by thepistonfor conveying fluid" to exert an intermittent pressure on thei shank, a passage controlled by the piston foi' admitting fluid from said constant pres- .sure cylinder portion to exert an intermittent pressure on the inner'face of said piston head, a passage for admitting fluid from said constant pressure portion of the cylinder to exert an intermittent pressure on the outer surface of said piston head, exhaust passages for said intermittently supplied cylinder portions, a valve to control said piston head outer surface supplying passage and said exhaust passages and means for moving said valve to open. said supply passage and close the exhaust passage for said piston head outer`surface near the end of the piston stroke in one direction, and to close said supply passage, open said exhaust passage for the piston head outer surface and close said exhaust passage for the piston head inner surface near the en'd of the piston stroke in the other direction.

In a'fluid operated percussive tool, a cylinder, comprising a smaller rearward bore and a larger forward bore, a piston in said cylinder, having a head and a shank, means for admitting fluidl constantly to the rear end of said small bore, a passage from said small bore controlled by said piston 'for conveying fluid intermittently. to the rear end of said large bore, a valve chest, a front end supply port leadingfrom said small bore to saidl valve chest, a fluid passage leading from the valve chest. to the front `end of the large bore, an exhaust pas- I sage leading from the rearward part of Vthe large bore to said /valve chest, an exhaust port' from said valve chest, a valve in said chest so arranged as to connect in one posi-' tion said .front end supply portand vsaid front end Huid passage, and said large bore "in testimony whereof, l have, he'suni@ rear end exhaust passage and sind exhaust set my hand.

p01t, and in the other position to connect Y LEWXS C. sind front en d uld passage and sald eX- Wxtnesses: 5 haust port, and means for operatmg sall FRED. S, OVERTON,

valve. OTT@ W. Homie-BEN. 

